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Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing ...
The reverse-thrust ratio (ratio of backward engine thrust to forward reverse thrust) can be as high as 84%. [6] However, this result is obtained with a cowl to attach air flow in a 7° angle and a large enough "target" (deflector door) installed. A reverse-thrust ratio of 55% can be reached on a simple target without the cowl. [7]
This malfunction allowed the development of considerable forward thrust by number 2 engine even though the thrust levers for all four engines were in the "reverse" position, which both increased the plane's stopping distance as well as giving it a tendency to steer to the right.
The equivalent concept for an airplane is thrust reversal. In a sailing ship astern propulsion can be achieved by the appropriate manipulation of the sails. In square-rigged ships 'backing the sails', that is, aligning the sails so that the wind impinged on the bow surface, could provide sufficient retrograde thrust to slow or reverse the ship.
To avoid a fatal collision, Miles immediately disengaged reverse thrust and both pilots slammed the throttle levers all the way forward and pulled back on their control columns to abort the 737's landing and initiate a go-around. They pushed so hard on the throttles that Miles fractured his thumb. [6]
[citation needed] The NTSB determined that the probable cause was the pilots' failure to use available reverse thrust promptly to safely decelerate or stop after landing, which resulted in a runway overrun. This failure occurred because the pilots' first experience and lack of familiarity with the airplane's autobrake system distracted them ...
Reverse thrust and reverser door deployment is inhibited in the absence of weight on the aircraft's wheels (i.e. in flight) and the reverser doors only began to open upon the second touchdown. The aircraft lifted off the ground before the reverse door cycle was completed and reverse thrust did not activate.
A design fault of the DC-8 had caused the thrust reverser of #4 engine to engage when the thrust lever was rapidly set to idle. [1] 13 August 1966 An Aeronaves de Mexico DC-8-51 (XA-PEI, named Tenochtitlan) crashed 21 mi from Acapulco after a descent was made while turning during a training flight, killing the six crew. [1] 24 December 1966